Seems totaly pointless to me :shrug: ...
There is a lot of heat generated by lots of various components, these will all build up until you have a high (comparitivly) equalibrium, I'd guess between 30~40DegC, my mobo reaches 30DegC
out of case!...
All that work just to prevent condensation?, a maintanance nightmare!
, why not just thermostaticly control the TEC's so they don't dip below the dew point?...
Here's an interesting linky on mobo heat:
mobo thermal imaging...